(Xyz Materials on that monster also become Xyz Materials on this card.) Once per turn, you may detach 1 Xyz material from this card
This list ranks Amber cards from set four, Ursula's Return, by strength and utility
(You can even cast it at the end of an opponents turn, sweep on your turn, and get creatures at the end of your turn.) Its a nice flavor win, too, as that jaunt into exile represents their time spent in those incubation tubes
How do you find them
SR Super Rare War Rock Generations X TRAP During the Battle Phase, if your opponent controls more monsters than you do: Special Summon 1 "War Rock" monster from your Deck, and if you activated this card during your opponent's turn, for the rest of this turn while you control the face-up Special Summoned monster, your opponent's monsters cannot attack, except to attack that monster
Box Expected Value (EV) Calculation BOX market price: ~15,000